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In many cases, you will need to hire a prototype maker regardless of whether you're looking for a virtual or physical prototype. The first thing you should do is have any prototype maker sign a non-disclosure agreement.
Discuss your project thoroughly. Bring any sketches you may have. Tell them exactly what you want, including as many details as possible. And get an estimate of costs. Depending upon the size, complexity and materials of your project, costs could run high.
Remember that because your product is a work in progress, you will need to work closely with whomever you hire, so you must be able to communicate well with this person.